page_title: Battle of Wagram
section_title: Opening campaign
hierarchical_section_title: Battle of Wagram / Prelude / Opening campaign
caption_attribution_description: Eckmuhl_April_21.jpg, Map of the situation at the Battle of Eckmuhl as of Midnight April 21-22, 1809
context_page_description: The Battle of Wagram was a military engagement of the Napoleonic Wars that ended in a costly but decisive victory for Emperor Napoleon Bonaparte's French and allied army against the Austrian army under the command of Archduke Charles of Austria-Teschen. The battle led to the breakup of the Fifth Coalition, the Austrian and British-led alliance against France.
  In 1809, the French military presence in Germany was diminished as Napoleon transferred a number of soldiers to fight in the Peninsular War. As a result, the Austrian Empire saw its chance to recover some of its former sphere of influence and invaded the Kingdom of Bavaria, a French ally. Recovering from his initial surprise, Napoleon beat the Austrian forces and occupied Vienna at the beginning of May 1809. Despite the string of sharp defeats and the loss of the empire's capital, Archduke Charles salvaged an army, with which he retreated north of the Danube. This allowed the Austrians to continue the war. Towards the end of May, Napoleon resumed the offensive, suffering a surprise defeat at the Battle of Aspern-Essling.
context_section_description: By March 1809, war between Austria and France was imminent and the Habsburg army, 200,000 men strong, massed in the northwestern province of Bohemia, near the frontier with the Confederation of the Rhine, the French-dominated confederacy of German states. Austria hoped that Prussia would join the war and, by massing its main army in Bohemia, it signalled its intent to join up with the Prussians. However, by early April 1809, it became obvious that Prussia was not ready to commit, and the Austrians were forced to move their main army southwards, in a bid to launch their westward offensive along the Danube. Strategically, the decision was sound, since an offensive along the river valley allowed better protection for the Austrian capital. Nevertheless, the time-consuming manoeuvres to Bohemia and back cost the Austrians an entire month.
  On 9 April 1809, without any declaration of war, the main Austrian army crossed the Inn River into Bavaria, one of France's main allies, while secondary Austrian armies launched offensives of their own. Meanwhile, Napoleon was in Paris, conscious that the war was imminent but unaware that the Austrians were prepared for immediate offensive. Command of the French and allied army, styled Grande Armée d'Allemagne, was in the hands of Maréchal Berthier, a formidable officer when working as Napoleon's chief of staff, but completely out of his depth as a commander by proxy. Furthermore, in order to remain in close contact with Paris by military telegraph and to avoid provoking the Austrians, Berthier was initially ordered to set up his headquarters near Strasbourg, hundreds of kilometres away from the front line, before moving to Germany as war broke out. As a result, Berthier's response to Charles's invasion was timid and, after misinterpreting Napoleon's orders, he left two entire army corps in isolated positions. Consequently, during the first week of the campaign, Charles was able to advance virtually unmolested and take advantage of the poor French deployment. All changed from 17 April, when Napoleon arrived in person and began concentrating his available troops to meet the Austrian onslaught. Before Napoleon could concentrate his corps, Charles attacked Davout's isolated corps at Teugen-Hausen but the dogged French marshal repulsed the attackers. The tide of the campaign had turned but Napoleon misjudged the strategic situation, thinking that the force that had fought Davout was only a flank guard and that the main force lay before him; in reality it was the opposite. As the French took the offensive several actions ensued : Landshut, Abensberg, Eckmühl and Ratisbon, with the Austrians coming off worse each time and having their left wing cut off from the bulk of the army. In the end, however, Charles succeeded in avoiding a decisive defeat, preserving a combat-ready army which he directed north of the Danube, where he awaited Napoleon's next move.
  Charles's retreat left Napoleon with two options: pursue the defeated Austrian army north of the Danube or occupy Vienna, which was now covered by a secondary enemy force and could not hope to hold out. Uncharacteristically, Napoleon, who had stated on a number of occasions that the purpose of any campaign is to destroy the main army of the enemy, opted for the latter course of action and entered the enemy capital on 12 May, only to find the city's strategic bridges over the Danube blown up. With the emperor poised for an immediate continuation of the offensive north of the river, this was a considerable setback. Meanwhile, Charles brought the bulk of his remaining force on the northern bank of the river, close to Vienna, which lured Napoleon into attacking them right away. Napoleon's rushed crossing of the river was made on fragile, hastily built pontoon bridges, over an increasingly swollen river. The French crossing resulted in the Battle of Aspern-Essling, beginning on 21 May; the more numerous Austrian army faced only a fraction of the Grande Armée, as Napoleon was unable to bring through the bulk of his forces in time. Still, Charles's attem
caption: Battles of Eckmühl and Ratisbon
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